Perhaps if Drogo had been strong with the Force, he would not have died from a blood infection and a malicious doctor. Perhaps, as a Sith, he would have led his army across the Narrow Sea to victory over Westeros.

In this image by J.B. Casacop, Khal Drogo slays the rebellious Mago and rips out his throat and tongue. The lightsaber is just for show.